The porphyrin ligand of heme b. Heme b is a Fe(II) porphyrin complex readily isolated from the hemoglobin of beef blood, but also found in other proteins including other hemoglobins, myoglobins, cytochromes P-450, catalases, peroxidases as well as b type cytochromes. Protoporphyrin IX contains four methyl groups in positions 2, 7, 12 and 18, two vinyl groups in positions 3 and 8 and two propionic acid groups in positions 13 and 17.
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